CN1200920A - absorbent article - Google Patents

Abstract

The present invention provides an absorbent article 1 having a substantially elongated configuration, comprising a liquid-impermeable leak-proof layer 3, and a liquid-storage absorbent layer 2 disposed on said leak-proof layer 3, wherein the absorbent Layer 2 comprises a liquid-storing absorbent body 24 and a liquid-permeable topsheet 23, and is formed of a fixed portion 21 fixed to said leak-proof layer 3 and a pair of left and right free edge portions 22. , the free edge portions 22 are respectively located on the opposite left and right sides 22a in the longitudinal direction of the fixed portion 21, and have free ends respectively, and the absorber 24 is located between the fixed portion 21 and a pair of left and right sides. In the free edge portion 22.

Description

absorbent article

The present invention relates to absorbent articles such as sanitary napkins, incontinence pads, etc., which have good fit and high leak resistance.

As absorbent articles, such as sanitary napkins, incontinence pads, etc., substantially vertically elongated absorbent articles comprising a liquid-storage absorbent layer and a liquid-impermeable leak-proof layer have been widely used at present.

Such absorbent articles need to be leak-proof, especially to effectively contain leaks from the sides, and there are many solutions.

For example, a sanitary napkin is proposed in Japanese Unexamined Utility Model Publication (KOKAI) 1-12522, in which elastic bodies are provided on the left and right side edge portions of the absorbent article so that the user can wear it in a natural state. The side of the body has a circular configuration.

But in the sanitary napkin proposed here, the sanitary napkin moves with the shorts with the movement of the wearer during use, thus reducing the fit and leaking when sliding.

An absorbent article is proposed in Japanese Unexamined Utility Model Publication (KOKAI) 8-503638, in which three-dimensional gathers including a topsheet, a backsheet, and an elastic body are provided on the left and right sides of the absorbent article to Make the draped gathers stand up.

However, the sanitary napkin thus proposed cannot satisfy the required leak-proof performance, and the performance of preventing leakage from the side is lowered.

Therefore, an object of the present invention is to provide an absorbent article which has good fit and high leak-proof performance, and which can effectively prevent side leakage.

In order to solve the above problems, the inventors of the present invention conducted extensive and intensive investigations and studies, and as a result, found that the above objects can be solved by an absorbent article comprising a a fixed portion, and free edge portions respectively located on left and right sides of the fixed portion and having free ends.

The present invention provides an absorbent article having a substantially elongated configuration comprising a liquid-impermeable leak-resistant layer, and a liquid-storing absorbent layer disposed on said leak-resistant layer, wherein the absorbent layer includes a liquid-reserving absorbent body and liquid-permeable surface material, and is formed by a fixed portion and a pair of left and right free edge portions, the fixed portion is fixed on the leak-proof layer, and the free edge portions are respectively located on the fixed On the opposite left and right sides in the longitudinal direction of the part, and having free ends respectively, the absorber is in the fixed part and a pair of left and right free edge parts.

The absorbent article according to the invention has good fit and high leak-proof properties, and is particularly effective in preventing side leakage.

Description of drawings:

Figure 1 is a perspective view of one embodiment of an absorbent article of the present invention;

Fig. 2A is a sectional view along the line II-II of Fig. 1; and Fig. 2B is a sectional view along the line III-III of Fig. 1;

Figure 3 is a cross-sectional perspective view of another embodiment of the absorbent article of the present invention;

Fig. 4 is a cross-sectional perspective view of still another embodiment of the absorbent article of the present invention;

Fig. 5 is a cross-sectional perspective view of still another embodiment of the absorbent article of the present invention;

Fig. 6 is a cross-sectional perspective view of still another embodiment of the absorbent article of the present invention;

Figure 7 is a cross-sectional view of still another embodiment of the absorbent article of the present invention;

Fig. 8 is a perspective view of a sanitary napkin as a seventh embodiment of the absorbent article of the present invention;

Fig. 9 is a sectional view of the sanitary napkin shown in Fig. 8 along line II-II;

Fig. 10 is a sectional view of the sanitary napkin shown in Fig. 8 along line III-III;

Fig. 11 is a schematic diagram of the use state of the sanitary napkin shown in Fig. 8;

Fig. 12 is a perspective view of a sanitary napkin as an eighth embodiment of the absorbent article of the present invention;

Fig. 13 is a sectional view of the sanitary napkin shown in Fig. 12 along line VI-VI;

Fig. 14 is a sectional view of the sanitary napkin shown in Fig. 12 along line VII-VII;

15A and 15B are schematic diagrams illustrating a method of measuring the radius of curvature.

Hereinafter, the absorbent article according to the present invention will be described in detail with reference to the accompanying drawings.

Here, FIG. 1 is a perspective view of a sanitary napkin as the first embodiment of the absorbent article of the present invention; FIG. 2A is a sectional view of FIG. 1 along line II-II; and FIG. 2B is a sectional view of FIG. 1 along line III-III. Sectional view.

As shown in FIGS. 1 , 2A and 2B , the sanitary napkin 1 according to this first embodiment has a substantially elongated configuration, which includes a liquid-storing absorbent layer 2 , and a liquid-impermeable leak-proof layer 3 . In use, the sanitary napkin 1 is attached to underwear.

In the sanitary napkin 1 according to this embodiment, the absorbent layer 2 includes a liquid-storage absorbent body 24 and a liquid-permeable top sheet 23, and is formed of a fixed portion 21 and a pair of left and right free edge portions 22, said The fixing part 21 is fixed on the leak-proof layer 3, and the free edge parts are respectively located on the opposite left and right sides in the longitudinal direction of the fixing part 21, and have free ends 22a respectively, and the absorber 24 In the fixed part 21 and a pair of left and right free edge parts 22.

When using the sanitary napkin 1 according to this embodiment, the leak-proof layer 3 moves directly with the underwear, but the pair of free end portions 22 on the absorbent layer 2 does not directly follow the underwear.

More specifically, the free edge portions 22 respectively have elastic bodies 25 provided over a predetermined length in the longitudinal direction of the absorbent layer 2 , and the free edge portions 22 stand up toward the skin contact surface side due to the contraction of the elastic bodies 25 . The phrase "standing up" as used herein means not only a standing state but also a state of floating upward from the leak-proof layer.

The topsheet 23 is arranged to at least cover the skin-contacting surface side of the absorber 24, the fixed portion 21 is positioned at the central portion in the width direction of the absorbent layer 2, and a pair of free edge portions 22 are respectively on the opposite left side of the fixed portion 21. , the right edge is continuous. The phrase "continuous" as used herein means that the side edges of the fixed portion 21 and the side edges of the free edge portion 22 are continuous with each other.

As shown in Figures 2A and 2B, the absorbent layer 22 includes an absorbent body 24 and a topsheet 23, and the topsheet 23 is arranged to cover the outer surface and side surfaces of the absorbent body 24 and the bottom surface of the free edge portion 22 (not related to the leakproofing). layer 3 contact part). Due to this design, the absorber 24 is present in the entire width region of the absorber layer 2 . In the absorbent layer 2 , the second absorbent layer 27 is provided on the fixing portion 21 between the top sheet 23 and the absorbent body 24 .

As shown in FIG. 2, the leak-proof layer 3 includes a liquid-permeable sheet 31, a leak-proof sheet 32, and an absorbent portion 33 interposed therebetween. That is, as shown in FIG. 2, in the leak-proof layer 3, the absorbent portion 33 made of an absorbent sheet is sandwiched between the liquid-permeable sheet 31 and the leak-proof layer 32, and the liquid-permeable The sheet 31 and the leak-proof layer 32 are sealed at the peripheral edge portion of the absorbent portion 33 .

The absorbent layer 2 is placed on the liquid-permeable sheet 31 of the leak-proof layer 3, and fixed thereon by bonding with an adhesive applied to the opposite left and right side edge portions of the fixing portion 21. The longitudinally opposite end edges of the absorbent layer 2 and the leak-proof layer 3 are fixed together by heat sealing.

The width W1 of the fixing portion 21 is preferably 15-60 mm. The width W2 of the free edge portion 22 is preferably 5-30 mm.

The elastic body 25 is provided on the bottom surface of the absorbent body 24 at the free end 22a of the free edge portion 22 substantially along the opposite left and right side edge portions 24a, 24a of the absorbent body 24 over the entire area in the longitudinal direction of the absorbent body 24 on the side.

As materials for forming the elastic body 25, 25, those made of various rubbers such as polyurethane, polybutadiene, isoprene, etc., polymers of ethylene-ethylene acetate, and various shrinkable polyolefins can be used. Foam, etc. In order to obtain an advantageous effect (the desired effect of the present invention) without reducing wearing comfort, the elastic body 25, 25 preferably has a stress of 10-300 gf at 30% elongation.

There is no particular limitation on the predetermined length of the elastic body 25, 25. In order to make the free edge portions 22, 22 stand upright into a configuration that fits well on the wearer, the elastic body 25, 25 is preferably disposed on 15-90% of the entire length of the sanitary napkin 1, more preferably 50-90% of the length .

The leak-proof layer 3 is provided with an anti-slip device 34 on its bottom surface side to attach the sanitary napkin to an object to be attached, such as underwear, when worn. The width W3 of the sanitary napkin fixed by the anti-slip device 34 is preferably greater than the width W1 of the fixing portion 21 of the absorbent layer 2, because this makes it easier for the anti-leakage layer to move with the movement of the underwear. The anti-slip means is not particularly limited as long as it is commonly used, such as double-sided tape, hot-melt adhesive, mechanical hook, and the like. In this embodiment, a hot melt adhesive is applied as the non-slip means.

In this embodiment, two anti-slip means 34 are provided on opposite left and right side edges in the longitudinal direction of the sanitary napkin 1 . The width W3 refers to the distance between the outer edges of the two anti-skid devices 34 , 34 . If two or more anti-slip devices 34 are provided, the distance between adjacent anti-slip devices 34, 34 is fixed. Thus, in this case "the width of the fixing portion" includes the distance between adjacent anti-slip means.

The width W3 of the anti-skid device shown in FIG. 2 is preferably 30-80mm. If the sanitary napkin is of the flap type, ie flaps extending from longitudinally opposite sides thereof, it is preferred that the anti-slip means 34 are provided on the leak-proof layer 34 around the fastening portion. The anti-skid means 34 may be provided on the flap attachment portion which is provided on the backsheet side of the flap portion. This width (the distance between the outer and inner sides of the flaps deployed before wearing) is the "width of the portion to be fixed", ie, the width W3. In this case, the width W3 is preferably 100-180 mm.

As shown in FIGS. 1 and 2, in order to stand up the free edge portion 22 in a more favorable manner, groove portions 26 are formed in opposite left and right side edges of the fixed portion 21 on the opposite left and right side portions. The depth D of each groove portion 26 is preferably 0.1-5 mm. The width of each groove portion is preferably 0.1-5 mm.

As shown in FIG. 1 , the groove portion 26 including the side edges of the fixing portion 21 is formed in a configuration similar to the outer peripheral configuration of the sanitary napkin 1 . At the lateral sides of the fixed portion 21 , the fixed portion 21 and the free edge portion 22 are separated by a groove portion 26 .

Due to the provision of the groove portion 26, the body fluid can be more effectively prevented from spreading, and the groove portion 26 can also function as a flexible shaft, making it easier for the free edge portion to stand upward.

Materials constituting the various components of the sanitary napkin will be described below.

There is no particular limitation on the material of the top sheet 23 as long as the material is generally used as a top sheet of absorbent articles such as sanitary napkins and the like. For example, desirable materials include non-woven fabrics composed of synthetic fibers such as polyethylene fibers, polypropylene fibers, polyester fibers, polyethylene/polypropylene conjugate fibers, polyethylene/polypropylene conjugate fibers, etc., by making such as A porous film obtained by forming holes in a film such as polyethylene. Of these, porous nonwoven fabrics, porous polyethylene films, and the like that have undergone a pore-forming process to increase absorbency are particularly preferable from the viewpoint of absorbency.

As the material of the absorbent body 24, absorbent sheets and polymer sheets can be listed. The thickness of the absorbent body 24 is preferably 0.3-5 mm.

For the absorbent sheet and the polymer sheet, materials generally used in absorbent articles such as sanitary napkins can be used without particular limitation.

The absorbent sheet used particularly preferably in the present invention may be absorbent paper, nonwoven fabric, pulp sheet, etc. made of fibers and binders. The polymeric sheet may be a sheet made from fluff pulp and a mixture of fibers and superabsorbent polymer. Sheets made of a mixture of fibers and superabsorbent polymers may be made by dispersing the superabsorbent polymer layer by layer or three-dimensionally in the sheet.

Materials forming absorbent sheets as well as fibers used in polymeric sheets include cellulosic fibers such as wood pulp; regenerated cellulosic fibers such as viscose rayon and cupro rayon; hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers; and synthetic fibers whose surface has been treated with surfactants to make the surface hydrophilic, such as polyethylene fibers, polypropylene fibers, polyethylene terephthalate fibers, polyethylene/polypropylene conjugate fibers and polyethylene/polyethylene terephthalate conjugate fibers. For more satisfactory retention of hydrophilicity, cellulose fibers are preferred.

The superabsorbent polymers that can be used in the polymer sheet are preferably those that can absorb and retain 20 or more times their own weight when absorbing liquid and that can be gelled. Such superabsorbent polymers include starch, croscarmellose, polyacrylic acid or its salts, and polyacrylate grafted polymers. The polyacrylate salt is preferably sodium polyacrylate. Contains comonomers such as maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acryloylethanesulfonic acid, 2-hydroxyethyl(methyl) Acrylic acid esters or acrylic copolymers of toluenesulfonic acid are also preferred, but in such proportions that the properties of the superabsorbent polymer are not impaired.

It is particularly preferred that the superabsorbent polymers used are capable of absorbing and retaining large volumes of liquid by ion dialysis without leaking under pressure, and include water-insoluble and hydrophilic cross-linked polymer particles, which are obtained by polymerizing Acrylic acid or its alkali metal salt (such as sodium or potassium), etc. are then cross-linked to make it non-water-soluble.

Among the above-mentioned polymer sheets, preferred polymer sheets are made of hydrophilic fibers, heat-fusible bonding fibers or reinforcement aids, and superabsorbent polymers. The superabsorbent polymer is not present on the absorbent surface of the polymer sheet for absorbing liquids, but is distributed inside the polymer sheet and bonded to the hydrophilic fibers that make up the polymer sheet, and then hardening. The superabsorbent polymer is used in an amount of 5-300 g/m ² of the polymer sheet, and the thickness of the polymer sheet is 0.3-1.5 mm.

In such a polymer sheet, since the superabsorbent polymer is three-dimensionally fixedly dispersed in the monolayer sheet, the absorption performance of the superabsorbent polymer can be effectively exhibited. Also, gel retardation of superabsorbent polymers can be reduced. Therefore, bodily fluids pass smoothly through the absorbent sheet. In this way, absorbent sheets can be advantageously used to obtain high absorbent performance.

In the present invention, it is preferable to use a polymer sheet from the viewpoint of high absorbency of body fluids. Also, it is possible to superimpose the absorbent sheet and the polymer sheet on top of each other. If stacked together, the polymer sheet is preferably located in the lower layer, ie on the leakproof layer 3 side.

For the liquid-permeable sheet 31 forming the leak-proof layer 3, the leak-proof sheet 32, and the absorbent sheet as the absorbent portion 33, the elastic body 25, an adhesive for fixing the absorbent layer 2 and the leak-proof layer 3 , and the adhesive used to form the anti-slip means 34, those commonly used in absorbent articles such as sanitary napkins can be used without specific limitations.

In the sanitary napkin 1 thus described according to this embodiment, the leak-proof layer 3 is attached to underwear such as shorts by the anti-slip means 34 in use. And as previously mentioned, the absorbent layer 2 is not directly fixed on the underwear, but through the leak-proof layer 3 . Therefore, when the wearer moves, the anti-leakage layer 3 moves with the movement of the underwear, but the opposite left and right free edge portions 22 of the absorbent layer 2 do not directly follow. In this way, the effects caused by the motion of the wearer are reduced. Therefore, the absorbent layer 2 does not slip easily, and good fit can be obtained. Furthermore, since the absorber 24 is located on the side edges of the absorbent layer 2 and is provided with elastics, the absorbent layer 2 can maintain a normal good fit relative to the wearer's body. Since no gaps are formed and menstrual blood can be absorbed, side leakage is particularly effectively prevented.

According to the sanitary napkin 1 of this embodiment, even if excreted body fluid moves laterally beyond or beyond the free edge portion 22 of the absorbent layer 2, side leakage can be effectively prevented by the leak-proof layer 3 located outside the free edge portion 22. In particular, if the width of the anti-slip means 34 is greater than that of the fixed portion 21, the anti-leakage layer 3 moves with the movement of the underwear and completely covers the lower surface of the absorbent layer, thus being particularly effective.

Moreover, in the structure of this embodiment, if the present invention is applied to absorbent articles in which a large amount of bodily fluids are excreted, such as disposable diapers, incontinence pads, etc., it is very easy to take appropriate corresponding measures, such as in the leak-proof layer 3 The absorbent portion 33 comprises superabsorbent polymer.

The sanitary napkin according to this embodiment can be manufactured by forming the absorbent layer 2 and the leak-proof layer 3 by a conventional method, and then fixing them together using an adhesive 4. Layers 2 and 3 may be fixed at the same time when forming the trench portion. In addition, after the grooves are formed, the absorbing layer 2 formed with the grooved portion may be fixed on the leakage prevention layer 3 .

Another embodiment of the absorbent article of the present invention will now be described with reference to FIG. 3 .

Here, Fig. 3 is a perspective view of another embodiment of the absorbent article of the present invention.

In the sanitary napkin 1 according to the second embodiment shown in Fig. 3, the configuration of the groove portion is linear. The rest of the structure is the same as the first embodiment. Although no second absorber is provided, it can be provided if required.

As discussed, the configuration of the groove portion 26 is not particularly limited and may be selected as desired.

Since the sectional view of the sanitary napkin shown in FIG. 3 along line II-II is the same as that of FIG. 2, its description is omitted.

In the first and second embodiments, the fixed portion and the free edge portion are formed by a separate absorbent body and a separate topsheet, respectively. Figures 4-7 will describe other examples in which the fixed portion and the free edge portion are formed from two or more absorbers formed separately.

Here, FIGS. 4 to 7 are perspective cross-sectional views (perspective views taken in the width direction at the longitudinal center portion of the absorbent article) showing other embodiments of the absorbent article of the present invention, respectively.

In the following description, the same or similar components as those of the first embodiment are denoted by the same symbols plus 100, respectively, and only those points that are different from the first embodiment will be specifically described. Points not specifically described are the same as those of the first embodiment.

As shown in FIG. 4, in the sanitary napkin 101 according to the third embodiment, the fixing portion 121 includes a fixing portion topsheet 123A covering the outer surface side of a fixing portion absorbent body 124A. The free edge portions 122 each include a free edge portion surface sheet 123B covering the outer surface of the free edge portion absorber 124B. The free edge portion 122 is firmly fixed to the opposite left and right side portions of the fixing portion 121 at its base end portion 122b.

More specifically, in this embodiment, the leak-proof layer 103 includes only the leak-proof sheet 132 .

The fixed portion absorbent body 124A has a rectangular configuration (not shown), and is provided on the width center portion of the sanitary napkin. The fixed portion surface sheet 123A is provided to cover the outer surface side and the side surface sides of the fixed portion absorbent body 124A, and to cover the entire width-direction surface of the leak-proof sheet 103 .

Each free edge portion 122 includes a free edge portion surface sheet 123B that covers the outer surface of the strip-shaped free edge portion absorbent body 124B. By heat-sealing the base end portion 122b in contact with the opposite side edge 123B' to the side edge portion 121b of the fixed portion 121 (in which the fixed portion absorber 124A does not exist and only the fixed portion surface sheet 123A exists), the The free edge portion 122 is fixed to the fixed portion 121 . The free edge portion 122 is also integral with the leak-proof layer 103 .

At its portion adjacent to the fixed portion absorbent body 124A on the base end portion 122b side, the free edge portion 122 is folded back toward the outside of the sanitary napkin 101 in the width direction.

At the free end 122a of the free edge portion 122, the elastic body 125 is provided on the bottom surface side of the free edge portion absorber 124B.

The width W2' of those portions of the free edge portion 122 folded back and raised is preferably 5-30 mm, and the width W1' of the center portion 121a of the fixed portion 121 (where the fixed portion absorber 124A is provided) is preferably 15-60 mm. The width W1' of the central portion 121a is smaller than the width W3' of the sanitary napkin secured by the anti-slip means 34.

For the fixed portion absorbent body 124A, the fixed portion top sheet 123A, the free edge portion absorbent body 124B, the free edge portion top sheet 123B, the leak-proof sheet 132, etc., the absorbent body, top sheet material described in detail in the first embodiment can be used. , leak-proof sheet, etc., without specific limitation.

Also, in the sanitary napkin 101 constructed according to this embodiment, the absorbent article is secured to the undergarment in use in the same manner as in the first embodiment, and the leak-proof layer moves similarly with the movement of the undergarment, but the free edge The parts (particularly the upright parts) do not directly follow the movement of the undergarment and achieve the same effect. By fixing the fixed portion absorber 124A and the fixed portion surface material 123A on the leak-proof layer 103 including the leak-proof sheet 132 by using an adhesive or the like, and then fixing the free edge portion 122 on the fixed portion 121 by heat sealing, by This forms the sanitary napkin 101 according to this embodiment.

Absorbent articles according to fourth to sixth embodiments will be described below with reference to FIGS. 5-7 . In the following description, those points that are different from the third embodiment are specifically described. Points not specifically described are the same as those of the third embodiment.

As shown in FIG. 5, in the sanitary napkin 101 according to the fourth embodiment, the base end portion 122b of the free edge portion 122 is firmly fixed to the fixing portion 121. As shown in FIG.

More specifically, in this embodiment, by heat-sealing the base end portion 122b in contact with the opposite side edge 123B' of the free edge portion surface sheet 123B in the fixed portion 121 where the fixed portion absorbent body 124A is stored, part, thereby fixing the free edge part 122 to the fixed part 121.

The free edge portion 122 is folded back outward in the width direction on the base end portion 122b side.

As shown in FIG. 6, in the sanitary napkin 101 according to the fifth embodiment, the free edge portion 122 is firmly fixed to the fixing portion 121 at its middle portion 122C.

More specifically, in this embodiment, the free edge portion 122 is such that the base end portion 122b in contact with the opposite side edge 123B′ of the free edge portion surface material 123B is located at the side edge portion 121b of the fixed portion 121 (wherein there is no fixed portion absorbent body 124A, but only the fixed portion surface sheet material 123A), and the free end 122a is positioned on the side edge portion in a manner that covers the side surface and the side edge portion of the fixed portion absorbent body 124A the outer surface side. The free edge portion 122 is firmly fixed on the fixed portion 121 by heat sealing so that in the middle portion 122C of the free edge portion 122, that is, on those portions of the fixed portion absorbent body 124A located on the outer surface side of the side edge portion , forming the trench portion 126 .

The free edge portion 122 is folded back in the width direction outwardly from the sanitary napkin at the central portion in the middle portion 122C.

As shown in FIG. 7, in the sanitary napkin 101 according to the sixth embodiment, the free edge portion 122 is firmly fixed to the fixing portion 121 at its base end portion 122b.

More specifically, in this embodiment, the free edge portion 122 does not fold back, but stands up on the fixed portion absorbent body 124 .

Also, in the fourth to sixth embodiments, the absorbent article can be used in the same manner as the third embodiment, and the same functions and effects can be produced.

Other embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Here, FIG. 8 is a perspective view of a sanitary napkin as a seventh embodiment of the absorbent article of the present invention, FIG. 9 is a cross-sectional view of the sanitary napkin shown in FIG. 8 along line II-II, and FIG. 10 is a sanitary napkin shown in FIG. 8. The sectional view of the napkin along line III-III, and Fig. 11 is a schematic diagram of the use state of the sanitary napkin shown in Fig. 8 .

In the following description, those points that are different from the first embodiment are specifically described. Points not specifically described are the same as those of the first embodiment, and produce the same functions and effects.

As shown in FIG. 8 , a sanitary napkin 201 as an absorbent article of this embodiment includes a liquid-impermeable leak-proof layer 203 , and a liquid-storage absorbent layer 202 provided on the leak-proof layer 203 . The sanitary napkin 201 is substantially vertically long.

As shown in FIGS. 8-10 , in the sanitary napkin 201 according to this embodiment, the absorbent layer 202 includes a liquid-storage absorbent body 221 and a liquid-permeable absorbent covering the entire surface (the skin contact surface side and the bottom surface side) of the absorbent body 221 . Sexual surface material 222. On the absorbent layer 202, a fixed portion 220a formed by fixing the central portion 202a of the absorbent layer on the leak-proof layer 203 and a rear free edge portion 223 are formed, and a rear free edge portion 223 is formed. No leak-proof layer 203 is fixed. The elastic body 204 is provided at least a predetermined length on the rear edge portion 223 in the longitudinal direction of the absorber 221 so that the rear free edge portion 223 stands upward from the leak-proof layer 203 due to the contraction of the elastic body 204 .

More specifically, as shown in FIGS. 8-10, in the sanitary napkin 1 according to this embodiment, only the central portion 202a is firmly fixed on the leak-proof layer 203, and the front free edge portion 226 is connected to the rear free edge portion 223. formed together on top of it. The elastic body 204 is disposed on the front free edge portion 226, so that the front free edge portion 226 stands upward from the leak-proof layer 203 due to the contraction of the elastic body 204 .

A left free edge portion 224 and a right free edge portion 225 are formed on opposite left and right sides of the central portion 202a, respectively. The elastic body 204 is provided on the left free edge portion 224 and the right free edge portion 225 at a predetermined length along the longitudinal direction of the absorber 221 such that the elastic body 204 stands upward from the leak-proof layer 203 .

In this way, a front free edge portion 226 , a rear free edge portion 223 , a left free edge portion 224 and a right free edge portion 225 are formed. Make them stand upright under the action of the elastic body. As a result, the absorbent layer 202 is curved, having a cup-like configuration as a whole.

As shown in Figure 8, in order to make the front, rear, left and right free edge portions 226, 223, 224, 225 stand up on the absorbent layer in an advantageous manner to form a cup-shaped configuration with good fit, the absorbent A trench portion 206 is formed in layer 202 . In the groove portion 206, the second absorbent body 227 is provided on the absorbent body 221, thereby forming a three-dimensional configuration.

As shown in FIGS. 9 and 10, the leak-proof layer 203 includes a liquid-permeable sheet 232, a leak-proof sheet 231, and an absorbent sheet 233 interposed therebetween.

As shown in FIGS. 8-10 , the elastic body 204 is provided on the opposite left and right side edges in the longitudinal direction of the absorbent layer along the edge portion of the absorbent body 221 . The elastomer 204 is covered with a skin material 222 and bonded to the skin material by an adhesive (not shown). If the length of the absorbent layer is set to 100, the length of each elastic body is preferably 40-90.

It should be noted that the terms "front", "rear", "left", and "right" are used for convenience of description, and these words are not used to limit the orientation of the respective accessories unless otherwise specified.

The width W1 of the absorbent layer is preferably 30-100 mm, while its length L1 is preferably 150-350 mm.

The longitudinal curvature (radius of curvature) of the absorbent layer 202 is preferably 60-250 mm, and the transverse curvature (radius of curvature) thereof is preferably 30-100 mm. The radius of curvature is obtained as follows.

The curvature of the arc A shown in FIG. 15A = 1/radius of curvature (r). According to the third principle, the radius of curvature (r) can be represented by the following equation (1).

(rh) ² +a ² = r ² ... (1)

If equation (1) is expanded, the following equation (2) can be obtained.

r=(h ² +a ² )/2h ... (2)

In this way, as shown in Figure 15B, the sanitary napkin is considered as an arc A as a whole, and the height h of the part where the sanitary napkin stands upright from the bottom surface of the sanitary napkin is measured (when the sanitary napkin is placed on the table so that the opposite end of the sanitary napkin the distance from the point of contact (p) between the sanitary napkin and the table when the top is at the same height) and a representing half the apparent length of the bent sanitary napkin, then substitute the values of h and a into the equation (2 ), and thus the radius of curvature is obtained. Specifically, the sanitary napkin is placed under stress-free conditions to obtain a height h from opposite ends in the longitudinal direction (width direction) to the lowest point p. Likewise, obtaining the linear distance (2a) between the opposite ends of the sanitary napkin, a is calculated. The thus obtained h and a are substituted into the above equation (2), whereby the radius of curvature of the sanitary napkin is obtained.

The width W2 of the left free edge portion 224 and the width W3 of the right free edge portion are preferably 5-30 mm, and the length L2 of the front free edge portion 226 and the length L3 of the rear free edge portion 223 are preferably 30-150 mm.

The sanitary napkin according to this embodiment can be used in the same manner as known overnight sanitary napkins.

Because the composition of the sanitary napkin 201 according to this embodiment is as described above, as shown in FIG. The movement of the body bends/moves to better fit the wearer's body, no matter what type of shorts are worn, for example, even wearing loose-fitting shorts, they will move with the wearer's body, which can be obtained Good fit and almost no leaks.

An eighth embodiment of the absorbent article according to the present invention will be described below with reference to Figs. 12-14.

Here, FIG. 12 is a perspective view of a sanitary napkin as an eighth embodiment of the absorbent article of the present invention, FIG. 13 is a cross-sectional view of the sanitary napkin shown in FIG. 12 along line VI-VI, and FIG. Sectional view of sanitary napkin along line VII-VII.

Points not particularly described in detail are the same as those of the first to seventh embodiments.

As shown in FIGS. 12-14 , in the sanitary napkin 201 according to this embodiment, the absorbent layer 202 includes a liquid-storage absorbent body 221 and a liquid-permeable topsheet 222 covering at least the skin-contacting surface side of the absorbent body 221 . The longitudinal center portion 202a of the absorbent layer 202 is secured to the leak-proof layer 203, and a rear free edge portion 223 not secured to the leak-proof layer 203 is formed thereon. The elastic body 204 is provided on the rear free edge portion 223 with a predetermined length along the longitudinal direction of the absorber 221 so that the rear free edge portion 223 stands upward from the leak-proof layer 203 due to the contraction of the elastic body 204 .

More specifically, the sanitary napkin 201 according to this embodiment is a so-called overnight type sanitary napkin in which the length of the sanitary napkin itself is long (length: 250-400mm), and the rear part (located on the wearer's The dorsal part) expands laterally into a fan shape.

In the absorbent layer 202, the part of the absorbent layer 202 that is fixed on the leakproof layer 203 is defined as a central part 202a and a front part 227', while the rear free edge part 223 is not fixed on the leakproof layer 203, and thus is standable. of.

The rear free edge portion 223 is provided with the second absorber 221a such that the lateral central portion of the rear free edge portion 223 stands up (forms a three-dimensional configuration). The second absorber 221 a is provided between the absorber 221 and the top sheet 222 .

The elastic body 204 is provided on the left and right side edge portions of the rear free edge portion 223 along the side edges of the absorbent body 221 , and is covered by the surface sheet 222 .

Adhesive is coated on the bottom surface sides of the opposite left and right sides of the front portion of the leak-proof layer 203, thereby forming a pair of wing portions 27 with non-slip portions 271. In this embodiment, the wing portion 207 like other parts of the leak-proof layer 203 is formed of a liquid-permeable sheet 232, a leak-proof sheet 231, and an absorbent sheet 233 interposed therebetween. Instead of the absorbent sheet 233, it is also acceptable to bond the liquid-permeable sheet 232 and the leak-proof sheet 231 together.

The length L1 of the absorbent layer 202 is preferably 230-400 mm, while the length L2 of the rear free edge portion 223 is preferably 50-200 mm. In other words, the rear free edge portion 223 refers to a portion of the absorbent layer 2 having a predetermined length from the rear end of the absorbent layer 2 .

At the front portion 227' and the central portion 202a, on the opposite left and right side edge portions of the absorbent layer 202, the surface sheet 222 and the absorbent body 221 are integrally folded into a superimposed state, and a leak-proof wall 228 is formed.

Also in the sanitary napkin of this embodiment, the same effects as those of the sanitary napkins according to the first and seventh embodiments can be achieved.

The sanitary napkin according to this embodiment can also be manufactured in the same manner as the sanitary napkins according to the first and seventh embodiments.

The absorbent article according to the present invention is not limited to the above-mentioned embodiments, and many changes and modifications can be made without departing from the essence of the present invention.

For example, in the first embodiment, the leak-proof layer 3 is made of only the leak-proof sheet 32 (it is not necessary to provide the liquid-permeable sheet 31 and the absorbent portion 33).

The absorber 24 does not have to be arranged over the entire lateral area of the free edge portion 22 . For example, the elastic body 25 is provided at the edge ends of the free edge portions 22 , and the absorber 24 exists only on the substantially central portion of each free edge portion 22 .

If the free edge portion 22 can stand up, the elastic body 25 need not be provided on the free end 22a, and the elastic body 25 may be provided on the widthwise central portion of the free edge portion.

The fixing portion 21 can be fixed not only by an adhesive but also by heat sealing, ultrasonic sealing, or the like. In the above-described embodiment, in the fixing portion 21, the bonding region (fixing region) between the absorbent layer 2 and the leak-proof layer 3 is, for example, the opposite left and right side edge portions and the longitudinally opposite end edges of the fixing portion 21 . However, the fixed area may be the entire surface of the fixed part.

For example, in the eighth embodiment, the elastic bodies may be provided on laterally opposite left and right end portions of the absorbent article, and the left and right free edge portions may stand upward as in the seventh embodiment. The second absorbent body 202a has an elongated configuration extending to the rear part, and the absorbent body is erected so that it can fit well to the body of the wearer from the excretory part of the buttocks to the groove part, which is also possible. accepted.

In the eighth embodiment, the second absorbent body 221 a is provided between the absorbent body 221 and the surface sheet 222 . However, the second absorbent body 221 a may also be disposed between adjacent layers of the absorbent body 221 .

Claims (8)

1, a kind of absorbent commodity, it has extended basically configuration, and comprise non-liquid permeability application of anti-leakage layers and be arranged on liquid-keeping absorbed layer on the described application of anti-leakage layers,

Wherein, described absorbed layer comprises liquid-keeping absorber and liquid permeability top layer material, and partly form by standing part and a pair of left and right free edge, described standing part is fixed on the described application of anti-leakage layers, described free edge partly lays respectively on the left and right relatively side on the longitudinal direction of described fixed part branch, and having free end respectively, described absorber is in standing part and a pair of left and right free edge part.

2, absorbent commodity as claimed in claim 1, wherein, described free edge part has the elastomer of being arranged to predetermined length along the longitudinal direction of described absorbed layer respectively, and described free edge part is owing to described elastomeric contraction and towards edge-on of skin contact surface.

3, absorbent commodity as claimed in claim 1, wherein, described top layer material is arranged to cover at least the skin contact surface side of described absorber, described standing part is positioned on the transverse center part of described absorbed layer, and described free edge part forms with the relative left and right side continuous edge of described standing part respectively.

4, absorbent commodity as claimed in claim 1, wherein, its non-skin contact surface is provided with shoe, is used for described absorbent commodity is connected underwear in use, and by the fixed described absorbent commodity of described shoe described standing part greater than described absorbed layer on width.

5, absorbent commodity as claimed in claim 1 wherein, forms trench portions respectively in the left and right relatively side part of described standing part.

6, absorbent commodity as claimed in claim 1, wherein, described standing part and described free edge part form respectively, and described free edge part is securely fixed on the left and right relatively side part of described standing part in its base terminal part and/or pars intermedia office.

7, absorbent commodity as claimed in claim 1, wherein, described absorbed layer comprises the back free edge part that is not fixed on the described application of anti-leakage layers, described back free edge part has the elastomer that a longitudinal direction along described absorbed layer is arranged to predetermined length at least, and described back free edge part erects towards skin contact surface owing to described elastomeric effect.

8, a kind of absorbent commodity, it has extended basically configuration, comprises non-liquid permeability application of anti-leakage layers and is arranged on liquid-keeping absorbed layer on the described application of anti-leakage layers, and described absorbent commodity is in use attached on the underwear,

Wherein, described absorbed layer comprises liquid-keeping absorber and liquid permeability top layer material, and partly form by standing part and a pair of left and right free edge, described standing part is fixed on the described application of anti-leakage layers, described free edge partly is positioned on the left and right relatively side on the described standing part longitudinal direction, and respectively has a free end

In use, described application of anti-leakage layers can move along with moving of underwear, but described a pair of free edge part on absorbed layer can not directly move along with the mobile of underwear.

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